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Revenue - Fulfillment Costs (Details)
3 Months Ended
Nov. 30, 2018
USD ($)
Capitalized Contract Cost [Line Items]  
Capitalized costs $ 33,200,000
Amortization 15,500,000
Impairment costs $ 0
Minimum  
Capitalized Contract Cost [Line Items]  
Capitalized cost, amortization period 1 year
Maximum  
Capitalized Contract Cost [Line Items]  
Capitalized cost, amortization period 3 years